Grinding and polishing machine.



PATENTED APR. 18, 1905.

E, G. SOHRADER.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV. 14, 1903.

2 SHEETS-SHEET l.

dew

PATENTED APR. 18, 1905.

E. O. SCHRADBR.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV. 144 1903.

2 SHEETS-SHEET 2.

Patented Aprll 18, 1905.

UNTTED STATES PATENT @FFTCE.

ERNEST (J. SCHRA D ER, ()F P ITlSBURt PENNSYLVANIA.

GRINDING AND POLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 787,405, dated April 18, 1905.

Application filed November 14,1903. Serial No. 181,175.

T0 (6// w/tont if Iii/(14 concern:

le it known that l, lluvns'r l. Seuuannu, a

citizen of the United States, residing at liuox i The invention relates to machines employed for polishing articles of glassware; and the iu vention consists in certain features of construction, as hereinafter set forth.

In the drawings. Figure l is a sectional side elevation of the machine. Fig. is a front elevation thereof, and Fig. 3 is an elevation of one of the revoluble workholders detached.

()ne of the features of the invention is the construction of the polishing-wheel. This comprises a rotary head A, mounted upon a suitable arbor. such as B, and supported in bearings on a frame, such as (I. The head A is provided witha peripheral extension formed of a soft and somewhat resilient material adapted to form the grinding-sm-facc upon which the abrasive or polishing material may he placed. l have found that cork formed a suitable material for this purpose, its lightness, toughness, and resiliency all being favorable to its alteration.

As shown in the drawings, l) is an annular disk, of cork, which surrounds the periphery of the head A and is clamped thereto, preferably by a clampil'igplate 1/, which presses the cork against the clamping-llangeb. The plate 1/ is secured to the head by screws 1'.

The polishing of the work is performed, preferably, on the periphery of the disk I). To this end rotary work-ladders are provided, preferably of the following construction: It is a rotary arbor orspindle journaled in bearings F and provided at one end with a holding-head 1/, on which the work isplaced. is a bail or strap pivotally secured to the bearings l and extending around the work on the holder 1/. f is a set-screw engaging with the end of the bail and adapted to bear centrally upon the work to hold the latter upon the head is a springshwvml upon the spindle and adapted to yieldingly press the same longitul l l 1 l i l l i l l dinally, so as to hold the work on the head (Z against the set-screw is a handle embracing the spindle and engaging with a grooved bearing therein, said handle being adapted to retract the spindle against thetcnsion of the spring 1/ for insertingor removing the work from the head (I. The hearings F are secured to a rock-frame F, and the latter is pivotally secured at 1' to a frame or bearing (l, adjnstably secured to the main frame C.

H is a drive beltor chain which passes over pulleys or sprockets I and I on the spindle E and the pivot J is a pulley connected to the sprocket .l and driven by a belt K, which passes over a pulley L on a shaft M. This shaft is driven by suitable means, such as a wormwheel j and worm Z.

'llheshaft N is preferably d riven from the arbor B through the medium of a belt 0, passing over the pulleys P and Q, respectively, on the shaft N and arbor B.

1 preferably provide automatic means for drawing the abrasive material on the periphcry of the grinding-disk I). As shown, this comprises a rotary shaft R, which carries one or more brushes S. These brushes are passed in the rotation of the shaft K through a receptacle, such as the trough T, which contains the abrasive material, and in the rotation of said brush the material is thrown into contact with the periphery of the revolving disk I). The shaft R is also driven by the shaft N by means of the worm meshing with the wormgearing m, which drive the pulley 1/, connect ed by the belt 11 with the pulley on the shaft h.

To prevent the scattering of the abrasive material about the centrifugal connection during the rotation of the disk I), the grinder is preferably incased by a surromnling shield U,

thereon. This will cause the rotation of the grinder, and at the same time the shafts N and M are driven through the medium of the connections described. These shafts, as has been described, respectively, drive the rotary brushes S and revolve the spindle E, which supports the work-holder. The operator first places the article to be polished upon the head (Z of the spindle E and then secures it in this position by turning the bail 6, so that the setscrew f will bear againstthe end of the work at its center of rotation. By reason of the constant operation of the brushes S the periphery of the grinding-disk will be coated with the abrasive material, so that the work when pressed against the disk will be ground or polished while it is constantly revolved on the spindle E.

If desired,the machine may be provided with more than one work-holder, so that a number of articles may be simultaneously operated upon by the grinder. As shown,a second work-holder is arranged on the frame with the axis of its spindle arranged slightly above the spindle of the other holder, so as not to interfere therewith. A plurality of grinderdisks may also be secured to the same arbor, and, as shown, the machine is provided with two of said disks.

It will be understood that the rock-frame F permits of rocking the work toward or from the periphery of the grinder-Wheel to throw it in or out of operative relation thereto.

\Vhat I claim as my invention is 1. In a polishing-machine of the character described, the combination with a grindingwheel, of a work-holder in operative relation thereto, means for depositing abrasion material on said wheel at a point spaced from said operative position of the Work-holder, and connecting means for automatically imparting simultaneous movement to said wheel, holder and depositing means.

2. In a machine of the character described,

the combination with a polishing member, of 45 means for holding the work in operative relation thereto, including a rotary arbor, adapted to support the work at one end thereof, and a bail extending around said Work-supporting end and secured at its respective ends to one of said bearings, and means on said bail for retaining the Work against said end.

3. In a machine of the character described, the combination with a polishing member, of means for holding the Work in operative relation thereto, including a rotary arbor, adapted to support the Work at one end thereof, and a bail extending around said work-supporting end and pivotall y secured at its respective ends to one of said bearings, and means on said bail for retaining the work against said end.

i. In a machine of the character described, the combination With a polishing member, of means for holding the work in operative relation thereto, including a rotary arbor adapted to support the Work at one end thereof, and a bail extending around said work-supporting end and secured at its respective ends to one of said bearings, and adjustable means on said bail for retaining the work against said end.

5. In a machine of the character described,

the combination with a polishing member,

ERNEST C. SCHRADER.

I/Vitnesses:

A. BEYER, B. L. SUCCOP. 

